Large metal plate suspended ceiling structure with air purification function and construction method of large metal plate suspended ceiling structure

The invention relates to a large metal plate suspended ceiling structure with an air purification function, which comprises a supporting steel frame, a decorative plate, a suspender and a negative oxygen ion generator, the supporting steel frame is provided with a first fixing piece for fixing the supporting steel frame on a structural beam, and the large metal plate suspended ceiling structure further comprises a conversion frame, the supporting steel frame is provided with an installation assembly used for fixing the conversion frame, the conversion frame is fixedly provided with a lamp holder, and the negative oxygen ion generator is arranged on the lamp holder. A plurality of connecting frames are fixedly arranged on the conversion frame, a plurality of mounting plates are arranged on the decorative plate in a sliding mode, fixing assemblies used for preventing the mounting plates from sliding on the decorative plate are arranged on the mounting plates, and first connecting pieces used for fixing hanging